How do I avoid capital gains tax in Washington state?

It is not possible to erase a taxable gain after you have already sold the asset. However, if you plan before you sell, you can generally structure the deal so the Washington capital gains excise tax doesn't catch you.

What is Washington’s capital gains tax really?

It is a state excise tax on the sale of specific long-term assets owned by individual taxpayers. Washington does not calculate this from scratch. They start the calculation leveraging the long-term capital gain amounts you report on the federal tax return. 

What sales are usually in-scope, e tax?

It generally applies to profits from selling assets held for more than one year like stocks & bonds, mutual funds and cryptocurrency. It also applies to specific sales of business interests if they are connected to Washington.

How do I avoid capital gains tax in Washington state legally?

It is possible to keep taxable Washington gain at zero by pulling specific levers before signing a deal.

• Use the annual deduction — for tax year 2025, taxpayers can deduct $278,000 from their gains — you only pay tax on the profit that exceeds this amount
• Split a large sale across calendar years — instead of selling everything in one massive transaction, consider selling in smaller chunks over two different years — this lets taxpayers use the standard deduction twice
• Offset gains with investment losses — if you have other investments that have lost value, selling them in the same year can lower your total "net" gain — lowering the amount Washington uses to calculate the tax
• Donate appreciated stock — if you give shares directly to a charity or donor-advised fund before selling them, that built-in gain is removed from your return entirely
• Confirm exemptions — check the table above — if your asset is in an exempt category — like real estate — Washington does not tax it at all

What are the key numbers for 2025 planning?

The state has introduced tiered rates for the 2025 return — which is due April 15, 2026.

How can Clarity Tax Group help?

If you are preparing for a major sale, our expert team can model the options and document your Washington allocation. We can file the return directly through the Department of Revenue’s MyDOR system. Reach out to us to talk through the amounts and numbers before closing the deal.